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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Apr 2009 Posts: 232 Shop Shark | | Shop Shark Joined: Apr 2009 Posts: 232 | Does anybody know approximatly how long it shoud take for the heat riser flap to move after startup? I have a new bi-metal spring and the flapper does not bind but it appears to remain in the horizontal position even after reaching full water temp. | | | | | Joined: Jan 2010 Posts: 4,263 Shop Shark | | Shop Shark Joined: Jan 2010 Posts: 4,263 | after it warms pull up on the throttle rod at the carb while watching it.
| | | | | Joined: Feb 2011 Posts: 583 'Bolter | | 'Bolter Joined: Feb 2011 Posts: 583 | Mine had too much tension on the spring and wouldn't open at all. I bent the end tab slightly to give it less tension and now it opens fully after about 10 minutes with the engine running and stays open until the engine cools down. It then closes.
1939 Chevrolet Stake Truck
| | | | | Joined: Jun 2010 Posts: 384 Shop Shark | | Shop Shark Joined: Jun 2010 Posts: 384 | My valve is moving well.
But it will not stay open even when really warm.
When I pull the throttle I can see it opens but then it closes again. Bad spring ?
I have a new spring so I think I will change it.
Just have to be careful not braking the clamps holding the spring and then remember the position so it points the correct way.
1/2 of a turn to tighten the spring as I remember?
My Chevy Viking 1959Ulf Hedlund. Eskilstuna. Sweden [email protected]Also: Ford Galaxie 4 dr 1959 Ford Custom 4 dr 1964 Ford Mustang GT 2005
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